public class Example4_10{
    public static void main(String[] args) {
        Lader2.下底=100;
        Lader2 laderOne=new Lader2();
        Lader2 laderTwo=new Lader2();
        laderOne.设置上底(28);
        laderTwo.设置上底(66);
        System.out.println("laderOne的上底："+laderOne.获取上底());
        System.out.println("laderOne的下底："+laderOne.获取下底());
        System.out.println("laderTwo的上底："+laderTwo.获取上底());
        System.out.println("laderTwo的下底："+laderTwo.获取下底());
    }
}